RFR: 8287378: GHA: Update cygwin to fix issues in langtools tests on Windows

[Christoph Langer]

This fixes the Windows GHA test failures that popped up short time ago, e.g. [these](https://github.com/RealCLanger/jdk/runs/6598399845)

Failing tests:
tools/javac/Paths/MineField.sh
tools/javac/Paths/wcMineField.sh

I've debugged it and it comes down to calls to javac/java in the test through env are failing with RC 127. E.g. here:
https://github.com/openjdk/jdk/blob/e44465d4d6eaddebfc5a1b149223aa8332affa8b/test/langtools/tools/javac/Paths/MineField.sh#L218

Don't know why but I figured that the test failure goes away with current cygwin.

It should be ok to update cygwin now because the bug that made JDK-8276854 necessary seems to be fixed.

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Commit messages:
 - JDK-8287378

Changes: https://git.openjdk.java.net/jdk/pull/8903/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8903&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287378
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8903.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8903/head:pull/8903

PR: https://git.openjdk.java.net/jdk/pull/8903